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If a website seems suspicious, for example, an unfamiliar website is asking for personal information or trying to download something without permission, a person can click the orange flag and report it to Google. The color of the flag will also change if Google suspects a website is suspicious.

"Google Safe Browsing helps protect over four billion devices every day from threats like phishing and malware by showing warnings to users when they attempt to navigate to dangerous sites or download dangerous files," the company said in the extension's page.

The new tool is the latest extension Google developed to protect people while browsing the web.

Google cross-checks the login credentials against a regularly updated database of more than four billion username and password entries that it has collected from sources such as password dumps.

Hackers responsible for data breaches on sites like Yahoo or LinkedIn sometimes post large databases of people's usernames and passwords online. Because many people use the same passwords across sites, bad actors could try to use the information to gain access to other accounts.